Does your jeep have the 4.7L engine (hydraulic cooling fan) or the 4.0L engine (electric cooling fan)? I presume the 4.0L, since the hydraulic cooling fan even runs without any electrical input, even though at a low 400 rpm.
Did you check the fan fuse first? Did you try and put 12V directly on the fan motor, to see if it runs? The 2004 model uses two separate low and high speed relays, which are in the power distribution center under the hood. You can swap both relays to eliminate a bad low speed relay.
Bad temperature switch?
SOURCE: radiator fan not working replaced relay,temp
You didn’t mention replacing the temperature sensor located
on the block in the path of the ‘cooled’ coolant.
I can’t tell you any closer where to look for it since you
didn’t specify which engine you have.
This device is a solid state item called a thermistor.
With the air temperature around 77 degrees F and a 'cold' engine, it should
measure about 10,000 Ohms and hot, around 1,200 Ohms while disconnected from
its mating connector.
With the ignition on, and the connector disconnected from
the sensor, you should measure about 5 volts coming from the ECU.
If this has failed, the ECU is not getting the right info
back from the sensor and doesn’t know if the fan is needed or not.
SOURCE: needs new radiator
Initially is posible, only check the size engine:
* 1999-2000 Jeep Grand Cherokee WJ V8 Engine
* 1999-2001 Jeep Grand Cherokee WJ 6L Engine
* 2001-2003 Jeep Grand Cherokee WJ 4.7L Engine
In here you can find the replacement reference guide: Radiator Removal/Replacement and Front End Disassembly (pre 01 4.7 WJ)
I hope help you whit this (rated). Good luck.
SOURCE: Changing spark plug wires on 2001 Jeep Grand cherokee
yah direct ignition coil pack does away for the need a a distributer cap and rotor.much higher energy ignition system where the computer tell when to fire.if that helps.not hard to change.as long as you change them one at a time so you don't screw up the order.
SOURCE: radiator fan motor on 2003 Jeep Grand Cherokee
I hope that you haven't went out and bought a whole new assembly due to the other poster's response. Yes you can just replace the motor otherwise why would you be able to buy the motors separately. There's usually 3 bolts that hold the fan shroud in that you have to remove along with the electrical plug. It takes some manipulation to get the entire fan/shroud assembly out (it helps to have someone underneath the vehicle guiding it) but once out you will see a clip over the top of the fan. It's kind of a challenge to get off but using a hammer and a flat head screwdriver you can work it off. Be aware that you have to put the clip back on so don't pry it off and ruin it....just kind of chisel it off. Once off, the fan blade comes off with a little effort. There's your exposed motor. Take off the 3 bolts and pull out the wires and replace it with your new motor. I hope this helps others....I couldn't find this information anywhere and figured it out along the way.
SOURCE: replacing the radiator in my
Regards,
Tony
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